75345221 has 16 divisors (see below), whose sum is σ = 89776128. Its totient is φ = 61873200.

The previous prime is 75345197. The next prime is 75345229. The reversal of 75345221 is 12254357.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 75345221 - 2⁶ = 75345157 is a prime.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75345229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20666 + ... + 24036.

It is an arithmetic number, because the mean of its divisors is an integer number (5611008).

Almost surely, 2^75345221 is an apocalyptic number.

It is an amenable number.

75345221 is a deficient number, since it is larger than the sum of its proper divisors (14430907).

75345221 is a wasteful number, since it uses less digits than its factorization.

75345221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3512.

The product of its digits is 8400, while the sum is 29.

The square root of 75345221 is about 8680.1624984789. The cubic root of 75345221 is about 422.3623883384.

Adding to 75345221 its reverse (12254357), we get a palindrome (87599578).

The spelling of 75345221 in words is "seventy-five million, three hundred forty-five thousand, two hundred twenty-one".